21001011211222 has 64 divisors (see below), whose sum is σ = 37965449088000. Its totient is φ = 8511239089152.

The previous prime is 21001011211181. The next prime is 21001011211291. The reversal of 21001011211222 is 22211211010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001011211196 and 21001011211205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382372279 + ... + 382427197.

It is an arithmetic number, because the mean of its divisors is an integer number (593210142000).

Almost surely, 2^{21001011211222} is an apocalyptic number.

21001011211222 is a deficient number, since it is larger than the sum of its proper divisors (16964437876778).

21001011211222 is a wasteful number, since it uses less digits than its factorization.

21001011211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57533.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001011211222 its reverse (22211211010012), we get a palindrome (43212222221234).

The spelling of 21001011211222 in words is "twenty-one trillion, one billion, eleven million, two hundred eleven thousand, two hundred twenty-two".